We can say the calorie is a unit of energy. We can?t just associate calories with food because everywhere there is some energy there is a calorie involved. Gasoline for example, like so many other things contains a lot of calories.
A calorie represents the heat needed to rise the temperature with 1 degree for 1 gram of water. We can see on every food pack the number of calories it contains. But the thing is the number you see on the package is in fact the value in kilocalories. 100 food calories represents 100.000 regular calories or 100 kilocalories.
The same principle is applied in sports. When somebody tells you , you?ve burned 100 calories that means 100 kilocalories.
A gram of carbohydrates contains 4 calories, a gram of fat 9 calories and a gram of protein contains 4 calories. Every food is based on these building blocks. It?s easy now to calculate based on the number of proteins, fat and carbohydrates the number of calories the food contains. So if we look on the back of any food aliment and see the number of food calories, we can say that amount is the kilocalories need it to burn it completely.
The human body burns the calories in different rates based on the metabolic process of every individual. The enzymes are the ones responsible to turning the fat intro fat acids and glycerol, the proteins into amino acids and the carbohydrates into glucose. These basic molecules are will be send into the bloodstream to your cells and they can be absorbed or they react with oxygen to release energy.
More information about the topic can be found on the site body building supplements, Calories Explained
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